"Official" AP Chemistry Study/Discussion Thread 2010!

<p>How does one determine the ‘rate-determining’ step? Lets say we have this set up:</p>

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<p>Which of the two middle rxns (both which supposedly run together in a pair) is the slow step? I understand rxn mechanisms (steps by which rxn occurs… such a complicated name for such a simple idea!), but I don’t get how to find the slow one…</p>